The second amendment gives people the right to own guns. The third amendment basically states that you can’t force people to house soldiers (more relevant in the older times). So, obviously the amendment we are dealing with here is the second amendment. A city or state is not allowed to ban something that is protected by the amendments, and having and owning a hand gun is protected by the second amendment (with a license). Therefore, the city of Chicago violated the second amendment. Your answer would be A.
Hope this helps :)